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2, 3 and even 4 different testing
frames may be built together, sharing the hydraulic
and the control system. IBERTEST combined
installations are designed, manufactured and
delivered upon demand, and they are a very cost-effective
solution for cases where the different tests can be
carried out in a series, not using the testing
frames simultaneously but alternatively.
Another case of advisability is, when the equivalent
individual machines are not to be used as frequently
for their purchase to be profitable.
The testing frame which is to work each time, is
chosen and automatically enabled from the control
desk, by means of some electrovalves –part of the
hydraulic system.
Typical instances of applications are one testing
frame for cement specimens (200 kN) combined with
one testing frame for concrete specimens (1500, 2000
or 3000 kN); one testing frame for concrete
compression tests with one bending and flexural
tests for prismatic and other sorts of building
material specimens such as kerb stones or
fibercement joists and beams; or the second testing
frame intended for tensile tests on corrugated bars,
etc.
Combining testing frames like these or other
different ones will make sense as long as all
testing frames are powered the same way (either
hydraulic or electromechanical), and as long there
are enough data acquisition or measurement channels
available. That is: considering that magnitude
transducers (for pressure, stress or displacement
measurement) and load cells, each make use of at
least one channel.
With this regard it is worth to mention that
IBERTEST MDA digital modules feature 2 measurement
channels whereas systems named SW and W –computer
controlled- feature 16 channels, expandable up to
32. And that magnitude transducers may require
amplifiers accordingly (e.g: inductive extensometers).
As a consequence, the electric system must be fitted
with bigger wires, in order to properly feed all of
these elements.
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